CBCT Evaluation of the Shaping Characteristics of Hyflex EDM, VTAPER 2H and Twisted Files In The Mesial Canals Of Mandibular First Molars –An In Vitro Study.
Journal Title: International Journal of Medical Science and Innovative Research (IJMSIR) - Year 2017, Vol 2, Issue 6
Abstract
The main aim of root canal treatment is proper cleaning and shaping of the root canal system. The root canal instrumentation needs to preserve the existing root anatomy, the position of the apical foramen and the original curvature this is possible only when there is continuous tapering of the root canal which helps the irrigating solution to flow easily within canal to remove debris and for the proper placement of the obturating material. Considerable importance should be given not to cut excessive dentin to get adequate taper of the canal. So, the challenge for every file system is to clean and shape the root canal without cutting the excessive dentin. Preparation of root canal system includes both enlargement and shaping of the complex endodontic space together with its disinfection. To fulfill these requirements a variety of manual, rotary, and reciprocating instruments have been developed.1 The introduction of nickel-titanium (NiTi) instruments allowed a safer and easier preparation of root canals with complex anatomic characteristics. However, during preparation, especially when preparing curved canals, iatrogenic errors, such as ledges, zips, perforations, and root canal transportation, can occur. Therefore, co¬ronal enlargement and the prior creation of glide paths have been shown to minimize procedural errors during root canal treatment.6,16 Technological advancements in rotary nickel-titanium (NiTi) instruments have led to new design concepts and easier and faster techniques that preserve the original canal shape with considerably less iatrogenic error HyFlex rotary instruments (Coltene-Whaledent, Allstetten, Switzerland) have been introduced. They are made from a controlled memory NiTi wire, which is manufactured by a unique process that controls the material’s memory. This EDM feature makes the files extremely flexible and makes the instruments more resistant to cyclic fatigue than non-EDM NiTi instruments. The HyFlex instrument has a symmetric cross-sectional design with 3 cutting edges. Unlike other instruments, deformed HyFlex instruments are able to regain their original shape after a sterilization procedure. These NiTi files are manufactured by an innovative method that gives control over the material’s memory. Twisted file (SybronEndo, Orange, CA, USA) is manufactured by twisting a NiTi wire with a triangular cross-section and R-phase crystalline structures created by heating and cooling. After completion of twisting, the file is heated and cooled again to maintain its new shape while converting back into its austenite crystalline structure. It is another novel file that uses a combination of continuous rotation and reciprocating motion. The file uses continuous rotation when it is exposed to minimal or no applied load and uses reciprocal motion when it engages dentin and a load is applied. Manufacturers have claimed that this adaptive technology and twisted file design using R-phase treatment increase debris removal and flexibility and allow the file to adjust to intracanal torsional forces depending on the amount of pressure placed on the file. V Taper 2H (SS White Dental Inc., Lakewood, NJ, USA) were only recently released. VTaper 2H variable taper Ni-Ti rotary files feature a parabolic cross-section design that combines high efficiency and flexibility while being safe and resistant to fracture. These files provide better access for irrigation and cleaning, and three dimensional obturation by providing a deep apical shape.
Authors and Affiliations
Dr Annil Dhingra
Keywords
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